https://www.sciencedaily.com/releases/2019/01/190115111912.htm > One of the most important aims of contemporary scientific research is knowing exactly where the transition occurs from the quantum world to the classical world and why it occurs -- in other words, finding out what makes the production of entropy predominate. This aim explains the current interest in studying mesoscopic systems, which are not as small as individual atoms but nevertheless display well-defined quantum behavior. > A new experimental study by researchers from Brazil and elsewhere offers an important contribution to this field. An article about it has recently been published in Physical Review Letters.